Things I liked:I'm giving it a full 5 stars. I noticed this did wonders for my MP-61 when used with the sight inserts I also bought with it. The gun went from generally hitting the target to consistent dime size groups at 12 feet which is all the room I have in my apartment. It took several minutes to dial in but once I had it in it was grouping very nice. A single click on the elevation and one on the windage changes everything down range. What others should know:Really changes the game on an MP-61. Well worth the time and price.

Things I liked:This sight was very easy to install and zero in. I changed the blades on the front sight twice and in both cases, I was able to zero in the sight in less than 10 shots. I was firing from 21 feet into a Camo 6x6 pellet trap. I am able to get quarter size groups shooting free-hand from that distance. If I shoot off of a rest, I feel I could get tighter groups.Things I would have changed:I have no negatives on this product. I have been very pleased with the function of the sight.What others should know:I'm 71 years old with 71 year old eyes. For me, I have problems sighting in low light. I have a Winchester M14 CO2 rifle with a "peep" rear sight and have the same difficulty in low light. This may be the nature of a peep sight. However, with good light, This is a tremendous sight.